Java模拟HTTP的Get和Post请求

   1. import org.apache.commons.httpclient.HttpClient; 
   2. import org.apache.commons.httpclient.HttpMethod; 
   3. import org.apache.commons.httpclient.HttpStatus; 
   4. import org.apache.commons.httpclient.URIException; 
   5. import org.apache.commons.httpclient.methods.GetMethod; 
   6. import org.apache.commons.httpclient.methods.PostMethod; 
   7. import org.apache.commons.httpclient.params.HttpMethodParams; 
   8. import org.apache.commons.httpclient.util.URIUtil; 
   9. import org.apache.commons.lang.StringUtils; 
  10. import org.apache.commons.logging.Log; 
  11. import org.apache.commons.logging.LogFactory; 
  12.  
  13. import java.io.BufferedReader; 
  14. import java.io.IOException; 
  15. import java.io.InputStreamReader; 
  16. import java.util.Map; 
  17.  
  18. /**
  19. * HTTP工具箱
  20. *
  21. * @author leizhimin 2009-6-19 16:36:18
  22. */ 
  23. public final class HttpTookit { 
  24.         private static Log log = LogFactory.getLog(HttpTookit.class); 
  25.  
  26.         /**
  27.          * 执行一个HTTP GET请求，返回请求响应的HTML
  28.          *
  29.          * @param url                 请求的URL地址
  30.          * @param queryString 请求的查询参数,可以为null
  31.          * @param charset         字符集
  32.          * @param pretty            是否美化
  33.          * @return 返回请求响应的HTML
  34.          */ 
  35.         public static String doGet(String url, String queryString, String charset, boolean pretty) { 
  36.                 StringBuffer response = new StringBuffer(); 
  37.                 HttpClient client = new HttpClient(); 
  38.                 HttpMethod method = new GetMethod(url); 
  39.                 try { 
  40.                         if (StringUtils.isNotBlank(queryString)) 
  41.                                 //对get请求参数做了http请求默认编码，好像没有任何问题，汉字编码后，就成为%式样的字符串 
  42.                                 method.setQueryString(URIUtil.encodeQuery(queryString)); 
  43.                         client.executeMethod(method); 
  44.                         if (method.getStatusCode() == HttpStatus.SC_OK) { 
  45.                                 BufferedReader reader = new BufferedReader(new InputStreamReader(method.getResponseBodyAsStream(), charset)); 
  46.                                 String line; 
  47.                                 while ((line = reader.readLine()) != null) { 
  48.                                         if (pretty) 
  49.                                                 response.append(line).append(System.getProperty("line.separator")); 
  50.                                         else 
  51.                                                 response.append(line); 
  52.                                 } 
  53.                                 reader.close(); 
  54.                         } 
  55.                 } catch (URIException e) { 
  56.                         log.error("执行HTTP Get请求时，编码查询字符串“" + queryString + "”发生异常！", e); 
  57.                 } catch (IOException e) { 
  58.                         log.error("执行HTTP Get请求" + url + "时，发生异常！", e); 
  59.                 } finally { 
  60.                         method.releaseConnection(); 
  61.                 } 
  62.                 return response.toString(); 
  63.         } 
  64.  
  65.         /**
  66.          * 执行一个HTTP POST请求，返回请求响应的HTML
  67.          *
  68.          * @param url         请求的URL地址
  69.          * @param params    请求的查询参数,可以为null
  70.          * @param charset 字符集
  71.          * @param pretty    是否美化
  72.          * @return 返回请求响应的HTML
  73.          */ 
  74.         public static String doPost(String url, Map<String, String> params, String charset, boolean pretty) { 
  75.                 StringBuffer response = new StringBuffer(); 
  76.                 HttpClient client = new HttpClient(); 
  77.                 HttpMethod method = new PostMethod(url); 
  78.                 //设置Http Post数据 
  79.                 if (params != null) { 
  80.                         HttpMethodParams p = new HttpMethodParams(); 
  81.                         for (Map.Entry<String, String> entry : params.entrySet()) { 
  82.                                 p.setParameter(entry.getKey(), entry.getValue()); 
  83.                         } 
  84.                         method.setParams(p); 
  85.                 } 
  86.                 try { 
  87.                         client.executeMethod(method); 
  88.                         if (method.getStatusCode() == HttpStatus.SC_OK) { 
  89.                                 BufferedReader reader = new BufferedReader(new InputStreamReader(method.getResponseBodyAsStream(), charset)); 
  90.                                 String line; 
  91.                                 while ((line = reader.readLine()) != null) { 
  92.                                         if (pretty) 
  93.                                                 response.append(line).append(System.getProperty("line.separator")); 
  94.                                         else 
  95.                                                 response.append(line); 
  96.                                 } 
  97.                                 reader.close(); 
  98.                         } 
  99.                 } catch (IOException e) { 
100.                         log.error("执行HTTP Post请求" + url + "时，发生异常！", e); 
101.                 } finally { 
102.                         method.releaseConnection(); 
103.                 } 
104.                 return response.toString(); 
105.         } 
106.  
107.         public static void main(String[] args) { 
108.                 String y = doGet("http://video.sina.com.cn/life/tips.html", null, "GBK", true); 
109.                 System.out.println(y); 
110.         } 
111. }